Thanks for the write up bill, I used this to install Speed Daddy headers, high flow cat, and 31" thrush on my brother in laws 99 GPGT.
I just wanted to leave a little note here regaurding the upstream o2 sensor for the people who plan to bash their firewall in. There is a hole directly towards the front of the car from where the o2 would hit. It is up over the cradle and between the oil pan and power steering rack. I slipped a 4' crow bar right into that hole and smashed that firewall like a gentlemen. The cradle even holds the bar for you should you need to adjust position.
